<template>
    <div class="todo-container">
        <div class="todo-wrap">
            <Header :addTodo="addTodo"></Header>
            <List :todoList="todoList" :deleteById="deleteById" :changeDone="changeDone"></List>
            <Footer
                :countSelected="countSelected"
                :countAll="countAll"
                :deleteAllDone="deleteAllDone"
                :changeAllStatue="changeAllStatue"
            ></Footer>
        </div>
    </div>
</template>

<script>
import List from "./components/List";
import Footer from "./components/Footer";
import Header from "./components/Header";
export default {
    name: "App",
    components: {
        Header,
        List,
        Footer,
    },
    data() {
        return {
            todoList: [],
        };
    },
    mounted() {
        this.todoList = JSON.parse(localStorage.getItem("todoList"));
    },
    methods: {
        addTodo(obj) {
            this.todoList.unshift(obj);
        },
        deleteById(id) {
            this.todoList = this.todoList.filter((item) => {
                return item.id !== id;
            });
        },
        changeDone(id) {
            this.todoList = this.todoList.map((item) => {
                if (item.id === id) {
                    item.done = !item.done;
                }
                return item;
            });
        },
        deleteAllDone() {
            this.todoList = this.todoList.filter((item) => {
                return item.done === false;
            });
        },
        changeAllStatue(newVal) {
            this.todoList = this.todoList.map((item) => {
                item.done = newVal;
                return item;
            });
        },
    },
    computed: {
        countSelected() {
            return this.todoList.reduce((pre, cur) => {
                if (cur.done) pre++;
                return pre;
            }, 0);
        },
        countAll() {
            return this.todoList.length;
        },
    },
    watch: {
        todoList: {
            deep: true,
            handler() {
                localStorage.setItem("todoList", JSON.stringify(this.todoList));
            },
        },
    },
};
</script>

<style>
/*base*/
body {
    background: #fff;
}

.btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}

.btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
}

.btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
}

.btn:focus {
    outline: none;
}
/*app*/
.todo-container {
    width: 600px;
    margin: 0 auto;
}
.todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
</style>
